Paranoid personality disorder (PPD) is a mental disorder characterized by paranoia and a pervasive, long-standing suspiciousness and generalized mistrust of others. People with this personality disorder may be hypersensitive, easily insulted, and habitually relate to the world by vigilant scanning of the environment for clues or suggestions that may validate their fears or biases. They are eager observers. They think they are in danger and look for signs and threats of that danger, potentially not appreciating other evidence.[1]

They tend to be guarded and suspicious and have quite constricted emotional lives. Their reduced capacity for meaningful emotional involvement and the general pattern of isolated withdrawal often lend a quality of schizoid isolation to their life experience.[2][verification needed] People with PPD may have a tendency to bear grudges, suspiciousness, tendency to interpret others' actions as hostile, persistent tendency to self-reference, or a tenacious sense of personal right.[3] Patients with this disorder can also have significant comorbidity with other personality disorders (such as schizotypal, schizoid, narcissistic, avoidant and borderline)

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A genetic contribution to paranoid traits and a possible genetic link between this personality disorder and schizophrenia exist. A large long-term Norwegiantwin study found paranoid personality disorder to be modestly heritable and to share a portion of its genetic and environmental risk factors with the other cluster A personality disorders, schizoid and schizotypal.[4]

Psychosocial theories implicate projection of negative internal feelings and parental modeling.[5]Cognitive theorists believe the disorder to be a result of an underlying belief that other people are unfriendly in combination with a lack in self-awareness.[6]

The World Health Organization's ICD-10 lists paranoid personality disorder under (F60.0). It is a requirement of ICD-10 that a diagnosis of any specific personality disorder also satisfies a set of general personality disorder criteria. It is also pointed out that for different cultures it may be necessary to develop specific sets of criteria with regard to social norms, rules and other obligations.[7]

The American Psychiatric Association's DSM-5 has similar criteria for paranoid personality disorder. They require in general the presence of lasting distrust and suspicion of others, interpreting their motives as malevolent, from an early adult age, occurring in a range of situations. 4 of 7 specific issues must be present, which include different types of suspicions or doubt (such as of being exploited, or that remarks have a subtle threatening meaning), in some cases regarding others in general or specifically friends or partners, and in some cases referring to a response of holding grudges or reacting angrily.[8]

PPD is characterized by a pervasive distrust and suspiciousness of others such that their motives are interpreted as malevolent, beginning by early adulthood and present in a variety of contexts. To qualify for a diagnoses, the patient must meet at least 4 out of the following criteria:[8]

Suspects, without sufficient basis, that others are exploiting, harming, or deceiving him or her.

Is preoccupied with unjustified doubts about the loyalty or trustworthiness of friend or associates.

Is reluctant to confide in others because of unwarranted fear that the information will be used maliciously against him or her.

Perceives attacks on his or her character or reputation that are not apparent to other and is quick to react angrily or to counterattack.

Has recurrent suspicions, without justification, regarding fidelity of spouse or sexual partner.

The DSM-5 lists paranoid personality disorder essentially unchanged from the DSM-IV-TR[9] version and lists associated features that describe it in a more quotidian way. These features include suspiciousness, intimacy avoidance, hostility and unusual beliefs/experiences.

Various researchers and clinicians may propose varieties and subsets or dimensions of personality related to the official diagnoses. Psychologist Theodore Millon has proposed five subtypes of paranoid personality:[10]

Paranoid personality disorder is listed in DSM-V and was included in all previous versions of the DSM. One of the earliest descriptions of the paranoid personality comes from the French psychiatrist Valentin Magnan who described a "fragile
personality" that showed idiosyncratic thinking, hypochondriasis, undue sensitivity, referential thinking and
suspiciousness.[13]

Closely related to this description is Emil Kraepelin's description from 1905 of a pseudo-querulous personality who is
"always on the alert to find grievance, but without delusions", vain, self-absorbed, sensitive, irritable, litigious,
obstinate, and living at strife with the world. In 1921, he renamed the condition paranoid personality and described
these people as distrustful, feeling unjustly treated and feeling subjected to hostility, interference and
oppression. He also observed a contradiction in these personalities: on the one hand, they stubbornly hold on to their
unusual ideas, on the other hand, they often accept every piece of gossip as the truth.[13] Kraepelin also noted that paranoid personalities were often present in people who later developed paranoid psychosis. Subsequent writers also considered traits like suspiciousness and hostility to predispose people to developing delusional illnesses,
particularly "late paraphrenias" of old age.[14]

Following Kraepelin, Eugen Bleuler described "contentious psychopathy" or "paranoid constitution" as displaying the
characteristic triad of suspiciousness, grandiosity and feelings of persecution. He also emphasized that these people's false
assumptions do not attain the form of real delusion.[13]

Ernst Kretschmer emphasized the sensitive inner core of the paranoia-prone personality: they feel shy and inadequate but at
the same time they have an attitude of entitlement. They attribute their failures to the machinations of others but
secretly to their own inadequacy. They experience constant tension between feelings of self-importance and experiencing
the environment as unappreciative and humiliating.[13]

Karl Jaspers, a German phenomenologist, described "self-insecure" personalities who resemble the paranoid personality.
According to Jaspers, such people experience inner humiliation, brought about by outside experiences and their
interpretations of them. They have an urge to get external confirmation to their self-deprecation and that makes them
see insults in the behavior of other people. They suffer from every slight because they seek the real reason for them in
themselves. This kind of insecurity leads to overcompensation: compulsive formality, strict social observances and
exaggerated displays of assurance.[13]

In 1950, Kurt Schneider described the "fanatic psychopaths" and divided them into two categories: the combative type that is
very insistent about his false notions and actively quarrelsome, and the eccentric type that is passive, secretive,
vulnerable to esoteric sects but nonetheless suspicious about others.[13]

The descriptions of Leonhard and Sheperd from the sixties describe paranoid people as overvaluing their abilities
and attributing their failure to the ill-will of others; they also mention that their interpersonal relations are
disturbed and they are in constant conflict with others.[13]

In 1975, Polatin described the paranoid personality as rigid, suspicious, watchful, self-centered and selfish, inwardly
hypersensitive but emotionally undemonstrative. However, when there is a difference of opinion, the underlying mistrust,
authoritarianism and rage burst through.[13]

In the 1980s, paranoid personality disorder received little attention, and when it did receive it, the focus was on its
potential relationship to paranoid schizophrenia. The most significant contribution of this decade comes from Theodore Millon who
divided the features of paranoid personality disorder to four categories:[13]